Method for preparing styrene/isoprene in-situ toughened polypropylene

A technology of isoprene and polypropylene, which is applied in the field of in-situ toughened polypropylene preparation, can solve the problems of heavy odor, decrease of melting index, sacrifice of tensile strength and modulus of polypropylene matrix, etc., and achieve good performance, low cost effect

A technology of isoprene and polypropylene, which is applied in the field of in-situ toughened polypropylene preparation, can solve the problems of heavy odor, decrease of melting index, sacrifice of tensile strength and modulus of polypropylene matrix, etc., and achieve good performance, low cost effect

CN102898591AInactive Publication Date: 2013-01-30EAST CHINA UNIV OF SCI & TECH
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  • Method for preparing styrene/isoprene in-situ toughened polypropylene

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] At room temperature, 0.030kg of isoprene, 0.030kg of styrene and 0.003kg of di-tert-butyl peroxide are mixed uniformly; the temperature of the nine-stage heating barrel of the twin-screw extruder is preset to 70°C along the extrusion direction. , 170℃, 200℃, 200℃, 200℃, 200℃, 200℃, 200℃, 205℃, the screw speed is 100r / min; when the heating cylinder temperature reaches the set temperature, the 3kg melt index is 2.20g / 10min Polypropylene pellets from the first section of the extruder are fed into the extruder at a feed rate of 0.1kg / min; at the same time, styrene, isoprene and di-tert-butyl peroxide are fed from the metering pump The liquid feed port of the third stage is injected at a rate of 0.002kg / min; vacuum devolatilization is performed at the eighth stage of the extruder. The obtained samples were pelletized, prepared, and tested for melt index and mechanical properties. The results are shown in Table 1.

Embodiment 2

[0028] At room temperature, 0.045kg of isoprene, 0.015kg of styrene and 0.0024kg of di-tert-butyl peroxide are mixed uniformly; the temperature of the nine-stage heating barrel of the twin-screw extruder is preset to be 70°C along the extrusion direction. , 170℃, 200℃, 200℃, 200℃, 200℃, 200℃, 200℃, 205℃, the screw speed is 100r / min; when the heating cylinder temperature reaches the set temperature, the 3kg melt index is 2.20g / 10min Polypropylene pellets from the first section of the extruder are fed into the extruder at a feed rate of 0.1kg / min; at the same time, styrene, isoprene and di-tert-butyl peroxide are fed from the metering pump The liquid feed port of the third stage is injected at a rate of 0.002kg / min; vacuum devolatilization is performed at the eighth stage of the extruder. The obtained samples were pelletized, prepared, and tested for melt index and mechanical properties. The results are shown in Table 1.

Embodiment 3

[0030] At room temperature, 0.015kg of isoprene, 0.015kg of styrene and 0.0012kg of di-tert-butyl peroxide are mixed uniformly; the temperature of the nine-stage heating barrel of the twin-screw extruder is preset to 70°C along the extrusion direction. , 170℃, 200℃, 200℃, 200℃, 200℃, 200℃, 200℃, 205℃, the screw speed is 100r / min; when the heating cylinder temperature reaches the set temperature, the 3kg melt index is 2.20g / 10min Polypropylene pellets from the first section of the extruder are fed into the extruder at a feed rate of 0.1kg / min; at the same time, styrene, isoprene and di-tert-butyl peroxide are fed from the metering pump The liquid feeding port of the third stage is injected at a speed of 0.001kg / min; vacuum devolatilization is performed at the eighth stage of the extruder. The obtained samples were pelletized, prepared, and tested for melt index and mechanical properties. The results are shown in Table 1.

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Abstract

The invention discloses a method for preparing styrene / isoprene in-situ toughened polypropylene, and relates to a method for preparing styrene / isoprene in-situ toughened polypropylene by reactive extrusion. According to the method, raw materials comprise polypropylene, styrene, isoprene and a peroxide initiator. The method is characterized by comprising the following steps of: adding the polypropylene from a main charging hole of a first section of an extruder; injecting styrene, isoprene monomers and the peroxide initiator into a third section of the extruder by a metering pump; and performing melt grafting at the reaction temperature of between 170 and 230 DEG C to obtain the in-situ toughened polypropylene material with high melt strength, wherein the toughness of the polypropylene can be improved obviously under the condition of the low using quantity of the monomers, the breakage elongation can be increased to 65 percent, and tensile strength of the polypropylene is equal to and even higher than that of pure polypropylene; and by the method, a toughening effect of a blending system of the polypropylene and 5 percent of butadiene-styrene-butadiene (SBS) can be achieved. According to the method, a process is simple, easy to control, low in cost and environment-friendly, and the product can be used for foaming and can be used as engineering stressed materials to be applied to the field of automobile industry.

Description

Technical field [0001] The invention relates to a method for preparing in-situ toughened polypropylene, in particular to a method for preparing styrene and isoprene co-grafted polypropylene by reactive extrusion. Background technique [0002] Polypropylene (PP) has become increasingly important in the plastic family for its excellent heat resistance and environmental friendliness. However, the semi-crystalline structure of PP leads to its low-temperature brittleness and poor impact performance, which limits its application in the field of engineering stressed materials. Therefore, the toughening modification of polypropylene in order to improve its toughness becomes the key technology. [0003] At present, the methods of toughening and modifying polypropylene are blending toughening, shape control toughening, cross-linking toughening, low foaming toughening, etc. Among them, blending modification is the most common, which uses similar solubility parameters. Reaction principle: Two...

Claims

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Application Information

Patent Timeline
30 Jan 2013
Publication
CN102898591A
IPC
C08F255/02; C08F212/08; C08F236/08; C08F4/34; B29C47/00; B29C47/92; B29C48/92
Inventors
夏浙安; 胡吉霞